124 



moisture — have made the largest per cent ol Increase of 

 any trees in the experiment. The excellent showing of the 

 trees receiving manure is also doubtless partially due to its 

 mulching effect. 



In the other cultural plats, all those involving tillage 

 without any definite fertilization have fallen much below 

 the mulched trees in rate of growth. The intercrop here has 

 apparently been a slight detriment, but the reduction in tree 

 growth is less than 6 per cent and judging from other results 

 this is probably due more to a slightly unfavorable location, 

 recently corrected by drainage, than to any necessary in- 

 fluence of the intercrops used. All cereals, excepting corn, 

 have been excluded here and elsewhere in our experiments 

 and none but tilled annuals have been used. The addition 

 of an annual covercrop in Plat II shows a slignt gain over 

 its absence in No. 13, but the benefit as yet is much too small 

 to pay for itself. 



Results on Young Trees at the College. — Most of the 

 results in the above experiment are brought out more clearly 

 and are extended considerably in two of the experiments 

 locateii near the College in the central part of the state. 

 The treatments and results in one of these experiments are 

 shown in Table II. 



The soil in this case is of limestone origin, technically 

 known as Hagerstown silt and clay loam, and it was badly 

 run down in fertility before the trees were planted. This 

 field also was in a rather poor sod, which waa left undis- 

 turbed in plats 7 to 9, and the trees were merely planted 

 with a spade and mulched, or mulched and manured, as 

 indicated in the table. The other plats were plowed in the 

 fall and thoroughly prepared as for corn before planting in 

 the spring of 1908. Plats 1, 4 and 7 contain 45 trees each 

 and the others 27, of three varieties, — York Imperial, Stay- 

 man Winesap and Baldwin. The other details of treatment 

 are as already indicated in connection with Table I, or as 

 shown in the present table. 



